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(Ne Medel.) A a sheets-sheet 1.

C. G'. P. DE LAVAL. AUTOMATIC FEED WATER REGULATOR.

Peeeneed June 1, 1897.

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(No Model.) 3 Sheets-Sheet 2.

C. G. P. DE LAVAL.

AUToMATIG FEED WATER REGULATOR.

No. 583,707. Patented June -1, 1897.

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(No Model.) 3 Sheets-Sheet. C. G. P. DE LAVAL. AUTOMATIC FEED WATERREGULATOR.

Patented June v1, 1897.

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. UNITED STATES PATENT OFFICE.

CARL GUSTAF PATRIK DE LAVAL, OF STOCKHOLM, SWEDEN.

AUTOMATIC FEED-WATER REGULATOR.

SPECIFICATION forming part of Letters Patent No. 583,707, dated June 1,1897.

Application Iiled September 9, 1895. Serial No. 561,905. (No model.)

Patented in England Septembell 20, 1895, No. 17,577;

' in Switzerland September 25,1895, No. 11,098; in Belgium September26,1895, No. 117,623; in France September 27, 18951110. 250,576;inItalySeptember 30, 1895, No.39,838; inNorway October 5,1895,No.4,692;in SpainNovember 25,

1895, No. 18,000; in Hungary December 26, 1895, No. 4,992; in

October 30, 1896, No. 4,383.l

.To all whom it may concern:

Be it known that I, CARL GUsTAF PATRIK D E LAVAL, a citizen of Sweden,residing at Stockholm, Sweden, have invented certain new and usefulImprovements in Automatic Feed-Tater Regulators, (for which I haveobtained Letters Patent in Germany, No. 87,911, dated June 2, 1896; inEngland, No. 17,577, dated September 20, 1895; in France, No. 250,576,dated September 27, 1895; in Belgium, No. 117,623, dated September 26,1895; in Italy, No. 39,838, dated September 30, 1895; in Spain, No.18,000, dated November 25, 1895; in Austria, No. 4,383, dated October30, 1896; in Hungary, No. 4,992, dated December 26, 1895 in Switzerland,No. 11,098, dated September 25, 1895, and in Norway, No. 4,692, datedOctober 5, 1895,) of which the following is a specification.

The present invention refers to an apparatus which is especiallyintended for being employed in combinationV with water-tube boilers ofthat type which consists of a single unbranched tube to one end of whichwater is supplied while from the other end steam is delivered. In suchwater-tube boilers it is desirable to make the water-supply dependent onthe amount of power which may be required by the varying loads of themotor, so that the quantity of water fed into the tube of the boiler atany moment corresponds to the quantity of steam vrequired by the amountof power at the same moment. For this purpose the invention consists inthe employment of a throttling device, the position of which is madedependent on the pressure of water from any suitable source and theamount of which is regulated by an organ which determines theconsumption of steamsuch as, for instance, the speed-governor of themotor. The throttling device may eitherbe located in a branch of thesupply-pipe of the feed-pump or in the suction-pipe of the same. In theiirst case all the quantity of water which the pump can deliver is fedinto the boiler when the throttlin g device is closed, at which momentthe boiler delivers its greatest quantity of steam, whereby the greatestGermany .Tune 2, 1896, No. 87,911, and in Austria amount of power forwhich the motor is constructed is produced. According as this amount ofpower is diminished the waterpressure acting upon the throttling deviceis correspondingly changed by the governor of the motor and thethrottling device opened thereby, so as to cause a part' of the water inthe supply-pipe of the pump to pass through said throttling device,whereby the amount of water delivered by the pump to the boiler is thuscorrespondinglyreduced. In the second case, when the throttling deviceis located in the suction-pipe of the feed-pump the position of thethrottling device is regulated by the governor of the motor in such amanner that the pump can draw only as great a quan- 'tity of water anddeliver it to the boiler as is demanded by the power to be generated bythe motor.

For further explanation of my invention reference is made to theaccompanying drawings, in which--` Figures 1 and 2 are respectively avertical section and a horizontal section on line 2 2,Fig. 1, of myimproved throttling device, showing its connection with a branch of thesupply'- pipe of the feed-pump. Figs. 3 and 4 are respectively avertical section and a plan, partly in horizontal section, showing theconnection of the throttling device with the cylinders of a doublefeed-pump for the purpose hereinafter described; and Fig. 5 is avertical section of the throttling device, showing its connection withthe suction-pipe of the feeding-pump.

Similar letters of reference indicate corresponding parts.

A, Figs. 1 and 2, represents the supply-pipe leading from the pump tothe boiler.

Bis a branch pipe of the supply-pipe A, with which branch pipe thethrottlin g device is connected.

The outlet-pipe D is arranged for placingv the throttling device incommunication with the atmosphere or a suitable receptacle. The

throttling device is made dependent on the pressure of the water in theconduit-pipe E, the degree of pressure being varied by the governor R ofthe power-generating motor.

For this purpose said governor can act, for instance, by means of alever f and connectingrod f upon a cock F or another analogous devicelocated in the conduit-pipe E. Said water is delivered through a pipe Mfrom any suitablesource, as, for instance, the feed-pump belonging tothe steam-boiler or from a separate pump.

The throttling device shown in Figs. l and 2 consists of a piston C',which is guided in a cylinder C, said piston being provided with twocross-bores H H and alongitudinal bore G, connecting said cross-bores.In the intermediate position of the piston C the crossbores H H closeabout half the branch pipe B and the outlet-pipe D for the water. Incase the water-pressure acting on the piston is great steam or waterunder corresponding pressure may be introduced through an inletpipe L,so as to act ou the upper end of the piston. A helical spring I may beplaced in the water-space on the lower side of the piston, so that thepressure of the water and spring balance the pressure of steam upon theupper end of the piston. The said steampressure on the upper end of thepiston may be omitted in case the water-pressure on the lower end of thepiston is small, and this water-pressure may then be balanced only bymeans of a spring, such as I, arranged at the upper end of the piston,oras a drawing or pulling spring on the lower end of the piston.

My improved throttling device acts as follows: With a normal load on themotor and a normal supply of steam the piston C occupies the positionshown in Fig. l. In this position of the piston the supply of water thatpasses from the pump through the supplypipe A to the boiler correspondsto the quantity of water required by the same, while a portion of thewater delivered by the pump is conducted through the channels of thethrottling device and is discharged through the outlet-pipe D. Then theload on the motor is increased, the governor B throttles the cock F,whereby the water-pressure on the lower end of the piston C' isincreased and the piston C moves upward, so as to throttle thecommunication between H and B and H and D. A smaller quantity of waterpasses then from the branch pipe B through the channels of thethrottling device, and the supply of feed-water to the boiler throughthe pipe A is correspondingly increased. On the contrary,when the loadon the motor is diminished the piston C moves in the opposite direction,whereby the current through the passages of the throttling device isincreased and the supply of feed-water to the boiler in a correspondingdegree diminished. Thus the boiler receives, by

the employment of the apparatus described,

by the latter.

connection of myimproved throttling device with a two-'cylinder pump,the cranks of which are located at an angle of forty-five degrees towardeach other. The arrangement shown is oi' advantage in such cases inwhich the pump is intended for delivering water of a high pressure andin which the channels H G H' of the throttling device are made small insection. It may then happen that dirt gathers in said channels, thusstopping them up. To avoid this inconvenience the branch pipe B isplaced in communication with the cylinder a of the pump, while theoutlet-pipe D is placed in communication with the cylinder b. Thequantity of water which passes through thethrottling device is thusforced from one cylinder to the other, passing the channels H G H' inopposite directions at each rotation of the crank-shaft of the pump. Ifdirt gathers in the channels during a stroke of the pump, it is forcedback again during the following stroke, and the channels are thus keptclean. The throttling device operates in other respects as beforedescribed with reference to Figs. 1 and `2, and like letters ofreference indicate analogous parts. No additional explanation istherefore necessary.

Fig. 5 shows the connection of myimproved throttlin g device with thesuction-pipe of the feed-pump. C indicates, as above, the cylinder forthe piston C. B is the suction-pipe for the feed-water; D, theoutlet-pipe; H G H, the channels in the piston; M, the inletpipe forwater under pressure; E, the outlet for the same from the chamber belowthe piston; F, the cock for regulating the amount of this pressure; R,the governor of the motor; Ii, a steam-inlet balancing the combinedpressure of the spring I and of the water from M The throttling deviceoperates as follows'. The motor Working against a normal load, thepiston C' occupies its intermediate position, shutting o one-half of thepassages B H and H D. The pump then draws the feedwater through thesuction-pipe and through the channels B H', G, and H D. By an increasedor diminished load on the motor, requiring a larger or smaller supply ofsteam, the governor R acts upon the cock F, so that the Water-pressureon the lower. end of the piston C' is either diminished or increased, sothat the piston C either moves downward, opening the passages B H H D,or upward, throttling said passages. Thus a greater or less quantity offeed-water is drawn by the pump and delivered to the boiler.

Having now particularly described my invention and explained in whatmanner the same is to be employed, what I claim as new 1S... the veryamount of feed-Water which corresponds to the varying load of the motorrespectively to the quantity of steam required l. In means forregulating automatically the feed-water supply to steam-boilers, thecombination of a throttling device, a'pipe Conducting water underpressure to said throttling device for actuating the same,-and means IIOfora regulating the amount of said Water-pressure according to theconsumption of steam, substantially as and for the purpose set forth.

2. In means for regulating automatically the feed-Water supply tosteam-boilers7 the combination of a throttling device, consisting` of amovable piston, provided with throttlingpassages, a cylinder for guidingsaidpiston, a pipe conducting Water under pressure to one end of saidpiston, and means for regulating the amount of said Water-pressureaccording to the consumption of steam, substantially as and for thepurpose set forth.

3. In means for regulating automatically the feed-Water supply tosteam-boilers the combination of a throttling device, consisting of apiston provided with throttling-passages, a cylinder for guiding saidpiston, a pipe conducting Water under pressure to one end of saidpiston, a throttling organ connected with the outlet-pipe for said Waterand acted upon by the speed-governor of the motor, substantially as andfor the purpose set forth.

4. In means for regulating automatically the feed-Water supply tosteam-boilers, the combination of a throttlin g device, consisting of apiston, provided with throttling-passages, a cylinder for guiding saidpiston, a pipe conducting Water under pressure to one end of saidpiston, a spring acting on said piston so as to balance thesteam-pressure, a throttling organ connected With outlet-pipe for saidWater and acted upon by the speed-governor of the motor, substantiallyas and for the purpose set forth. t

5. In means for regulating automatically thevfeed-water supply tosteam-boilers, the combination of a throttling device, consisting of apiston provided with a throttling-passage, a cylinder for guiding saidpiston, apipe conducting Water under pressure to one end of said piston,a pipe conducting steam or Water under a corresponding pressure to theother end of said piston, a spring acting on said piston so as tobalance, together With the Water-pressure, said steam-pressure, and acock or similar throttling organ connected with the outlet-pipe for saidWater and acted upon by the speed-governor of the motor, substantiallyas and for the purpose set forth.

6. In means for regulating automatically the feed-Water supply tosteam-boilers, the combination of a throttling device, consisting of apiston provided with throttling-passage, a cylinder for guiding saidpiston, a feed-pump with two cylinders, one of Which communicates Withthe inlet and the other with the outlet of the same, a pipe conductingWater under pressure to one end of said piston, a pipe conducting steamor Water With a correspending pressure to the other end of said piston,a spring acting on said piston so as to balance, together With theWater-pressure, said steam-pressure, and a cock or similar throttlingorgan connected with the outlet-pipe for said Water and acted upon bythespeed` governor of the motor, substantially as and for the purpose setforth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of tWo subscribing Witnesses.

CARL GUSTAF PATRIK DE LAVAL. Witnesses:

TYoKo RoBsAHM, WALDEMAR BoMAN.

